xjgl/step8.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

typedef struct {
    char id[20];
    char clas[20];
    char name[20];
    double score1;
    double score2;
    double score3;
    double score;
} Student;

Student students[1000];
int studentCount=0;

//输入学生信息 
void inputStudentInfo( ) {
    printf("Id ");
    scanf("%s", students[studentCount].id);
    printf("Class ");
    scanf("%s", &students[studentCount].clas);
    printf("Name ");
    scanf("%s", students[studentCount].name);
    printf("Score1 ");
    scanf("%lf", &students[studentCount].score1);
    printf("Score2 ");
    scanf("%lf", &students[studentCount].score2);
    printf("Score3 ");
    scanf("%lf", &students[studentCount].score3);

    // 计算总成绩
    students[studentCount].score = students[studentCount].score1 +
                                        students[studentCount].score2 +
                                        students[studentCount].score3;

    studentCount++;
}

//显示信息 
void displayAllStudents() {
    if (studentCount == 0) {
        printf("No students to display.\n");
        return;
    }
    int i;
    for (i=0; i < studentCount; i++) {
        // 输出学生信息
        printf("%s %s %s %.1lf %.1lf %.1lf %.1lf\n",
               students[i].id, students[i].clas, students[i].name,
               students[i].score1, students[i].score2, students[i].score3,
               students[i].score);
    }
}

void sortByClassAndScore() {
    if (studentCount <= 1) {
        // 无需排序
        return;
    }

    // 使用简单的冒泡排序
    int i;
    for ( i = 0; i < studentCount - 1; i++) {
    	int j;
        for ( j = 0; j < studentCount - 1 - i; j++) {
            if (atoi(students[j].clas) > atoi(students[j + 1].clas) ||
                (atoi(students[j].clas)== atoi(students[j + 1].clas)&&
                 students[j].score < students[j + 1].score)) {
                // 交换学生信息
                Student temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }
    for (i = 0; i < studentCount; i++) {
        // 输出学生信息
        printf("%s %s %s %.1lf %.1lf %.1lf %.1lf\n",
               students[i].id, students[i].clas, students[i].name,
               students[i].score1, students[i].score2, students[i].score3,
               students[i].score);
    }
}

//删除学生信息 id or name
void deleteStudent() {
    if (studentCount <= 1) {
        printf("No students to delete.\n");
        return;
    }

    char dele[20];
    printf("Enter the ID of the student you want to delete: ");
    scanf("%s", dele);

    int i,j;
    int found = 0;

    for (i = 0; i < studentCount; i++) {
       if ((strcmp(students[i].id, dele) == 0) || (strcmp(students[i].name, dele) == 0)) {
            found = 1;
            // 删除学生，将后面的学生向前移动
            for ( j = i; j < studentCount - 1; j++) {
                students[j] = students[j + 1];
            }

            studentCount--;
             for ( i = 0; i < studentCount; i++) {
        // 输出学生信息
               printf("%s %s %s %.1lf %.1lf %.1lf %.1lf\n",
               students[i].id, students[i].clas, students[i].name,
               students[i].score1, students[i].score2, students[i].score3,
               students[i].score);
           /* printf("Student with ID %s deleted.\n", studentId);*/
              }
              break;
       }
    }

    if (!found) {
    	// 输出学生信息
               printf("%s %s %s %.1lf %.1lf %.1lf %.1lf\n",
               students[i].id, students[i].clas, students[i].name,
               students[i].score1, students[i].score2, students[i].score3,
               students[i].score);
            /*printf("Student with ID %s not found.\n", studentId);*/
    }
}

//查询  id or cla 
void queryStudent() 
{
    if (studentCount == 0) {
        printf("No students to query.\n");
        return;
    }

    char quer[20];
    printf("Enter the ID of the student you want to query: ");
    scanf("%s", quer);

    int i;
    int found = 0;

    for (i = 0; i < studentCount; i++) {
        if (strcmp(students[i].id, quer) == 0||strcmp(students[i].clas,quer)==0) {
            found = 1;
            // 输出学生信息
            printf("%s %s %s %.1lf %.1lf %.1lf %.1lf\n",
                   students[i].id, students[i].clas, students[i].name,
                   students[i].score1, students[i].score2, students[i].score3,
                   students[i].score);
        }
    }

    if (!found) {
        printf("there is no eligible student");
    }
}



int main()
{

    while (1) {
        printf("1.input\n2.delete\n3.select\n4.order\n5.output\n6.quit\nplease input your option\n");
        int option;
        scanf("%d", &option);
        switch(option){
        	case 1:{
        		while(1)
        		{
        			inputStudentInfo();
        			printf("continue?\n");
                    char ch[20];
                    scanf("%s", ch);
                    if (strcmp(ch, "yes") != 0) {
                        break; // 输入no，则跳出循环
                    }
				}
				break;
			}
			case 2:{
				while(1)
				{
					deleteStudent();
					printf("continue?\n");
                    char ch[20];
                    scanf("%s", ch);
                    if (strcmp(ch, "yes") != 0) {
                        break; // 输入no，则跳出循环
                    }
				}
				break;
			}
			case 3:{
				while(1)
				{
					queryStudent();
					printf("continue?\n");
                    char ch[20];
                    scanf("%s", ch);
                    if (strcmp(ch, "yes") != 0) {
                        break; // 输入no，则跳出循环
                    }
				}
				break;
			}
			case 4:{
				if(studentCount>=3)
				{
					sortByClassAndScore();
				}
				break;
			}
			case 5:{
				displayAllStudents();
				break;
			}
			case 6:
			   exit(0);	
		}
	}
	return 0;
}